Without breakloop not much of a REPL

[SideStep]

According to this post: https://mikelevins.github.io/posts/2020-12-18-repl-driven/

Breakloop is a true differentiator for "real" REPLs. I can see how breakloop really is a game changer.

Also, there is no breakloop in modern languages such as clojure, which is heralded for it's REPL driven development, craftsmans' playground, live coding etc...

Is breakloop gone from modern REPL languages? Maybe it's not a big deal? Or is it?

[Brandon R]

I believe what's described in that post is possible in Clojure, at least to an extent. I can't remember where I saw it described, but I think it was a talk by Stuart Halloway. IIRC you can configure Clojure to run clojure.main/repl when an exception is thrown, this puts you into a new sub repl with the lexical bindings at that point in execution. You can inspect things here and I believe change things. I'm not sure about continuing running with new values, but I'm guessing that's possible too.

Maybe someone in this group can point to a good resource about this, as I didn't find it in a quick search.

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[Brandon R]

This may be the talk I was thinking of: https://vimeo.com/223309989

[Nesvarbu Nereikia]

Thanks Brandon, what a productivity booster the breakloop wold be, huh? Basically would save you time and mental energy every time you sprinkle your code with print statements now.

On Friday, January 29, 2021, Brandon R <brando...@gmail.com> wrote:

This may be the talk I was thinking of: https://vimeo.com/223309989

On Fri, Jan 29, 2021 at 10:04 AM Brandon R <brando...@gmail.com> wrote:

I believe what's described in that post is possible in Clojure, at least to an extent. I can't remember where I saw it described, but I think it was a talk by Stuart Halloway. IIRC you can configure Clojure to run clojure.main/repl when an exception is thrown, this puts you into a new sub repl with the lexical bindings at that point in execution. You can inspect things here and I believe change things. I'm not sure about continuing running with new values, but I'm guessing that's possible too.

Maybe someone in this group can point to a good resource about this, as I didn't find it in a quick search.

On Fri, Jan 29, 2021 at 6:09 AM SideStep <nesvarb...@gmail.com> wrote:

According to this post: https://mikelevins.github.io/posts/2020-12-18-repl-driven/

Breakloop is a true differentiator for "real" REPLs. I can see how breakloop really is a game changer.

Also, there is no breakloop in modern languages such as clojure, which is heralded for it's REPL driven development, craftsmans' playground, live coding etc...

Is breakloop gone from modern REPL languages? Maybe it's not a big deal? Or is it?

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[Andy Fingerhut]

There is no reason to merely imagine ... you can do it today.

Here is a transcript of Stuart Halloway's "REPL-Driven Development" talk with links to sources that he mentions: https://github.com/matthiasn/talk-transcripts/blob/master/Halloway_Stuart/REPLDrivenDevelopment.md

The part of that talk where he discusses a break facility in the REPL can be found by searching that transcript for "Joy of Clojure", the book where one implementation of this is given.

There is a link in the transcript to this repository, which has code you can copy and paste into your own project, or utility library, etc.

https://github.com/joyofclojure/book-source/blob/master/first-edition/src/joy/breakpoint.clj

The source for the macro named `contextual-eval` is here: https://github.com/joyofclojure/book-source/blob/master/first-edition/src/joy/macros.clj

Andy

On Mon, Feb 1, 2021 at 4:28 AM Nesvarbu Nereikia <nesvarb...@gmail.com> wrote:

Thanks Brandon, what a productivity booster the breakloop wold be, huh? Basically would save you time and mental energy every time you sprinkle your code with print statements now.

On Friday, January 29, 2021, Brandon R <brando...@gmail.com> wrote:

This may be the talk I was thinking of: https://vimeo.com/223309989

On Fri, Jan 29, 2021 at 10:04 AM Brandon R <brando...@gmail.com> wrote:

I believe what's described in that post is possible in Clojure, at least to an extent. I can't remember where I saw it described, but I think it was a talk by Stuart Halloway. IIRC you can configure Clojure to run clojure.main/repl when an exception is thrown, this puts you into a new sub repl with the lexical bindings at that point in execution. You can inspect things here and I believe change things. I'm not sure about continuing running with new values, but I'm guessing that's possible too.

Maybe someone in this group can point to a good resource about this, as I didn't find it in a quick search.

On Fri, Jan 29, 2021 at 6:09 AM SideStep <nesvarb...@gmail.com> wrote:

According to this post: https://mikelevins.github.io/posts/2020-12-18-repl-driven/

Breakloop is a true differentiator for "real" REPLs. I can see how breakloop really is a game changer.

Also, there is no breakloop in modern languages such as clojure, which is heralded for it's REPL driven development, craftsmans' playground, live coding etc...

Is breakloop gone from modern REPL languages? Maybe it's not a big deal? Or is it?

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